Armor-plating for safes, strong-rooms, and the like.



E. BAUER.

ARMOR PLATING FOB sArBs,sTRoNG RooMs,AND THE LIKE.

APPLICATION FILED JUNE 23, 1913.

UNITED sTATEs PATENT OFFICE.

BAUEN., or ZURICH, SWITZERLAND, AssIGNon To FRANZ BAUER a sHNE,

y lat-G., or Zumcm SWITZERLAND.

l ABMOBf-PLATING FOB SAFm,'STRONG-BO0MS, AND THE To all whom t mayconcern.: Be it known that I, EDWIN BAUER, a c1t1- zen of the SwissRepublic, residing at Zurich, in Switzerland, have invented certain newand useful Improvements in Armor-Plating for Safes, Strong-Rooms,

and the like, of which the following is a specification.

pen trates, so as to more 'effectively lock the skin Armor plates forsafes and the0 like have heretofore in some cases been constructed oflayers of different materials, or of the Same material, united by meansof a layer or layers of copper, which forms a good conductor of heat andwhereby a thin layer or layers of copper alloy, generally copper alloyed.with-iron, is or are formed at the places of contact. The severallayers are in this ease joined by means of cast copper, and this isrous, a quality which reduces the conductivity. Moreover, it is dincultto ei'ciently harden these plates owing to` those described, in regard`to fire-proof andA burglar-proof qualities. To this end I use a core ofmaterial which is a good conductor of heat, for example rolled or drawncopper, and cast around this core a skin of har-` dened iron (chilledwork),of suitable thickness, so that the two metals intimately unite,but do not fusev together. I may form holes in the core, linto which thecasting eto the core, the skin or envelop on opposite sides being joinedby the iron which has penetrated through the holes. A composite platethus farmed is `practically entirely proof against attack by means vof ablow- Specification of Letters Patent.

Patented Mar. 23, 1915.

Application led June 23, 1918. Serial 1I' o. 775,297.

- pipe, as the core conducts away the heat so rapidly that exposure tothe flame for many hours does not-result in penetration, the skin may bemelted in part.

In the accompanying drawings, Figure 1 1s an elevation of a plate madein accordthough ance with the-present invention. Fig. 2. is

thick to accomplish the purpose desired, the

perforations vc in the copper sheet" 'beingfilled by the iron during theprocess of castmgviie outer skin thereon.

at I claim as my invention and deslre to secure by'Letters Patent of theUnited States is 1. Plating for safes and the like comprising incombination a core of metal having a high degree of heat-conductivityand a skin of chill cast iron upon said core and enveloping the same. l

2; Plati for safes and the like comprising in com mation a core ofcopper and a skln of chill cast Airon upon said core and enveloping thesame.

3. Plating for safes and the like com prising in combination a core ofmetal having a high de of heat-conductivity, said core having oles, andaskin of chill cast iron upon said core, enveloping the same andpenetrating said holes.

In witness whereof I have signed thls specification in' the presence oftwo witnesses.

EDWIN BAUER.

Witnesses:

Cam. Guam, FRITZ Knm.

